large windows on North side of house
We have a 1960 ranch in CT and are remodeling it. We are considering adding an addition to the back of the house that would have a cathedral ceiling with large windows in it to capture the view of the surrounding woodland. Taller windows and ceilings would be preferable however we are concerned that the room will be cold and our energy bills will go up substantially, especially because the windows will be on the north-northwest side of the house. The window wall would be about 22' long; the addition is planned to jut out 14' from the house.
Has modern window technology and building construction progressed to the point where this is no longer a concern?
Or is this a bad idea for energy consumption? Will the room feel cold in our zone 5-6 weather? Is there a particular window that is recommended? Will it cost us a fortune?